Page end indicator



l PatentedJan. 2, 1945 "UNITED STATES PATIENT JOFF'ICE u M l p I a 2,366,265 I PAGE END INDICATOR ,FrankT. Jensen, Dysart, Iowa Application October 5, 1943, Serial No. 05 ,062

4 Claims.

The present invention relates to improvements in pageend indicating devices for typewriters and has for a primary'object thereof the provision of such an indicator which may be attached to a conventional typewriting machine.

Another object of the invention is toprovide a page end indicator which willsound a signal to indicate the attainment of at line at a predetermined distance frornthe bottom end of apage so that a suitable margin is provided thereat.

A furtherobject of the inventionis the provision of a page quickly and easily on a typewriter. e

Still another object of the invention is to proend indicator which may be mounted in operative position vide an indicating device of the aforesaidvchari acterwhich is relatively simple and construction and eflicient in use; i e

Other objects and advantages of the invention will become appar nt as the description progresses.

In the accompanying drawing forming a part of this specification and in which like numerals are employed to designate corresponding parts throughout; i e 6 Figure 1 is a top plan view compact in typewriter, A i i Figurezis an end elevational view of the same with knob carrying extension shaftsection removed, i Figures is an axial section throughthe assembled device, taken on line 33 of Figure 2,

Figure 4 is an inner end view of the lever carrying casing of the device, i i t Figure 5 is an end view of one section ofthe device,

Figure 6 is a plan view of a the grooved portion of the device,

Figure -7 is an end elevational view showing a modified construction of the device, and t Figure 8 is a view partly in axial section and development of partly in side elevation showing another modification of the device.

Referring to the preferred form of the invention, shown at Figures l to 6 inclusive, T indicates a conventional typewriter platen and K the turning knob removably connected with: an extension V of the shaft thereof. My improved page end indicating device em? bodies a cylindrical casing member lfl having one end closed by a circular end wall H provided with a central opening l2. At one point of its periphs ery the end wall I is formed with a radially projecting flanged restraining element I 3 having of a preferred form of the device mounted in association. with a aradialweb and a lip spaced from and concentric with the peripheral wall of the casing. The exterior of the circumferentialwall M of the casing hasformed therein a spiral groove l5 having 5 one end opening into a circular groove I6; Within the circumferential wall I4, adjacent its inner tubular axially extendingsocket 2| is formed at its outer side. The socket 2| is adapted to be slidably fitted over an end of the platen shaft and isreleasablyfastened thereon by a set screw 22 carriedbythe socket. In a radial boss 23 on the inner face of thedisk I9 is formed a radial bore 24 opening at the outer end of the boss and having slidably fitted therein a ratchet pin 25 tapered at its outer extremity to engage the rack 25 teeth ll. This ratchet is yieldingly pressed outward by a coilspring 26 to engage the teeth in such manner as to enablefrictional turning adjustment of the member ID. i

As shown at Figure 3,;an extension shaft 21 0 is disposed axially of the casing member and has a portion extending thereinto ing l2. The inner end of the shaft isformed with a reduced threaded stud 2 into the bore 20 and is also formed, at its medial portion, with an annular fiange29 disposed to bear againstthe outer face of the casing end wall II. The outwardly projecting portion of the shaft Z1 is non -circular, as indicated at 30, so as to receive thereon'the conventional turning A sounding bell 3| having a center aperture fitted over the stud 28 is removably held within the casing by the shaft 21, as illustrated at Fig ure 3. A bell striking lever structure is mounted within the casing in a plane transverse to the axis thereof and embodies a relativelyshort straight tripping arm 32 having and having its inner end gular directed hammer connected with an anarm 33.

extending hammer head 34. the arms and 33 is provided through which is extended a a bearing opening l9 isprovided a centrally i v 15 disposed interiorly threadedbore 20 while a through the open- 8 normaly screwed its outer end pointed The hammer 50, arm is advantageously bent at an acute angle and c has pivotaly connected to its free end an axially At the juncture of pivotscrew 35 en- 6 casing end wall II. A relatively long leaf spring 36 having one end fixed to and extending tangentially within the casing engages the arm 33 so as to yieldingly hold the same in position to maintain the hammer element 34 out of contact with the bell while a shorter spring 31 also fixed within the casing is positioned to limit and cushion striking movement of the arm 33. As can be seen at Figure 4, the radially extending tripping arm 32 extends through a slot 38 in the peripheral wall of the casing and protrudes outwardly thereof within the lip of the restraining element I3.

To one side of the typewriter is attached a right angular bracket 39 having a transversely directed flange 40 fastened to the machine frame by screws M and an outwardly directed arm 42 parallel with the axis of the platen. To the outer end of the bracket arm 42 is connected, by a hinged joint 43, a pivot arm 44 curved upwardly to provide a vertical offset between the bracket and a point above the casing 10. To the other end of this pivot arm is connected, through a pivoted knee joint 45, a horizontal extension bar 46 yieldingly held in an approximately horizontal position by an arcuate spring 41 having one end fixed to the arm 44 and the opposite end-bearing on the bar 46. A bearing yoke 48, connected with the outer end of the bar 46 by a pivot joint 49, carries a spindle 50 on which is rotatably mounted a fiat wheel As shown to advantage at Figure 1 the spindle 50 has a portion projecting laterally outward from the yoke for engagement with the bell lever as will appear hereinafter.

The exterior periphery of the grooved casing, as shown in the flat development thereof illustrated at Figure 6, is provided with numbered graduations 52 along the inner end portion of the spiral groove and designating typing pages of varying length such as 11 and 13 inches with marginal designations wherein the typing will be signaled at predetermined positions from the page end, for example one or two inches from the bottom end of the page.

Thus, the device is initially set for use by disposing the wheel 5l in the spiral groove at a selected graduation on the casing and in registration with a mark 53 on the platen at which the top edge of the page is to be positioned. As the typing of the page proceeds the follower wheel 5| will be caused to move axially outwardly along the casing and in the spiral groove, at the termination of which it will enter the circular groove'l6. When the wheel is in registration with the circular groove continued rotation of the casing with the platen will bring the protruding end of the lever arm 32 into contact with the spindle 50 of the wheel and will effect a turning of this arm together with the arm 33 fixed thereto so as to swing the hammer roller 34 from the right to the left hand side as indicated bylthe arrow at Figure 4. When the spindle has passed over the arm 32 and has released the same, the spring 36, brought under tension at such time, will throw the arm 33 to its reverse position and cause the hammer to strike the edge of the bell 3| and signal the attainment ofa desired marginal position on the typing-sheet. The spring 3'! partially cushions the return movement of the arm 33 and functions to move the hammer carrying arm slightly inward out of contact with the bell, as clearly illustrated at Figure 4, and in position for subsequent signaling action. The restraining element l3 will hold the spindle 50 against radial outward movement with respect to the axis of the casin In so as to assure tripping contact of the arm 32 therewith.

To restore the follower wheel to page starting position it is grasped and elevated by breaking the knee joint 45 against the tension of the spring 4'! to remove the wheel from the groove and allow inward swinging movement thereof to the starting end of the spiral groove. The pivot joint 49 provides flexibility for angular movement of the wheel 5| during its travel in the spiral groove upon rotation of the casing I.

In a modification of the invention, shown in Figure 7, a somewhat different form of follower support is provided for typewriters of a structure in which the upwardly disposed roller'may be disadvantageous. In this form of the device a down turned arcuate pivot arm 54 is connected, through a knee joint 55 with an arcuate extension arm 56, the two arms providing an approximately semicircular support which may have a horizontally extending lip 51 at the free end for convenient adjustment. A spindle and follower wheel supporting yoke 58 formed with a vertically extending pivot pin 59 connects with the lowermost portion of the extension arm. 56, the. pin projecting through a bore in. the arm and being held thereon by a nut 60 or the like. The wheel of the yoke 58 is normally held in the groove of the casing 10 by the action of an arcuate spring 6| having one end secured to the outer portion of the arm 54 and the opposite end slidably bearing against the' underside of the arm 56. To remove the follower and swing the same from signaling to starting position the arm 56 is swung downwardly against the tension of the spring Bl breaking the joint 55 and lowering the wheel carrying yoke 58 so as to swing the same to starting arrangement.

Another modification of the invention, illustrated at Figure 8, shows one form of the device in which the knob K may be disposed directly against the outer end of the casing H). For this purpose the relatively long extension shaft 21 is replaced by a relatively short stem 62, having the outer projection engaging a socket in the knob so that the latter may be disposed tightly I against the end of the casing. As clearly shown at Figure 8 the knob, herein designated as K is merely in the form of a disk having the central socket for the stem and without the axially extending socket structure shown in the preferred form of the invention.

It is to be understood that the forms of my invention herewith shown and described are to be taken as preferred examples of the same and that various changes relative to the material, size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described .my invention, I claim: 1. In an indicator of the character described, a member adapted for mounting at one end of a typewriter platen for rotation therewith, a hollow cylindrical member mounted on said first member for rotation with andangular adjustment with relation to the platen, the said cylindrical member having a spiral groove in the exterior thereof, an audible signal element carried by said first member within said cylindrical member, lever mechanism operative to strike the signal element mounted on said cylindrical member, and a, follower supported to engagethe spiral groove and move axially of the cylindrical member during rotation of the latter,

the said follower being adapted to engage the lever mechanism to effect sounding of the signal when a page on the platen attains a predetermined position.

2. In combination with a typewriter having a member and having a spiral groove 'in its ex-;

terior, coacting ratchet means on the said cylindrical casing and fastening member for frictional turning of the former with relation to the latter, a bell mounted in the casing, a striker carrying lever pivotally supported on the casing and having an arm projecting radially through an opening in the casing, and a follower sup ported on the typewriter in position to engage the spiral groove and move axially of the easing during rotation thereof to trip the lever and sound the signal when the bottom page end of a sheet on the platen attains a. predetermined position.

3. An attachment for a typewriter having a I with the bell, the said lever having an arm extending radially outward of the casing through an opening therein, a fixed support attached to the typewriter, a follower support arm connected to the support, and a. follower at the outer end of said follower support arm removably engageable with the spiral groove of the casing and movable axially thereof during rotation of the casing, the said follower having a projection operative to engage the projecting arm of the lever to trip the lever and sound the signal whenthe bottom end of a page on the platen attains a predetermined position.

4. An attachment for a typewriter having a rotative platen comprising, a, disk detachably secured toone end of the platen, a cylindrical casing rotatably associated with the disk and having a spiral groove exteriorly of its circumferential wall, a, signal bellmounted within the casing, a pivotally supported lever mounted on the casing and carrying a striker engageable with the bell, the said lever having an arm extending radially outward of the casing through an opening therein, a, fixed support attached to the typewriter, a, follower support arm connected to the support, a follower at the outer end of the said follower support arm removably engageable with the spiral groove of the casing and mov'able axially thereof during rotation of the casing, the said follower having a, projection operative to engage the projecting arm of the lever to trip the lever and sound the signal when the bottom end of a page on the platen attains a predetermined position, and an angular restraining element projecting radially from the casing and overhanging the projecting portion of the lever arm whereby to maintain the follower projection in contact with the said arm when the follower attains registration with the arm.

FRANK T. JENSEN. 

